[android-developers] call barcode scanner

i want to use "intent" to call "barcode scanner"
how can i write 口口口口口口口 source code???

Button ButtonCall = (Button) findViewById(R.id.ButtonCall);
ButtonCall.setOnClickListener(new Button.OnClickListener() {
public void onClick(View view) {
Uri uri = Uri.parse("tel:");
Intent i=new Intent(Intent.口口口口口口);
startActivity(i);
}

thanks...

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